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胡杨(Populus euphratica Oliv.)对干旱和盐碱具有极强的忍受能力,属于耐盐碱而非盐生植物,能在极端干旱、盐碱的荒漠地带中正常生长,被视为研究、发掘林木特异功能基因的模式生物[1]。Chen等发现,大多数植物耐盐性等生物表型是由多个基因片段共同调节控制[2],但目前大多数研究仅局限于单基因克隆,对大片段基因簇的功能研究鲜有报道[3]。鉴于此,张瑷等[4]、周婧等[5]等将胡杨基因组片段导入拟南芥(Arabidopsis thaliana (L.) Heynh)中挖掘潜在的胡杨耐盐功能基因簇,朱晓静[6]发现了与叶绿体发育有关的胡杨基因组大片段,王智[7]得到赤霉素高合成转化型拟南芥植株,但有关胡杨基因组片段潜在功能的挖掘仍需进一步深入研究。本研究将继续探索胡杨基因组片段功能,为进一步开展林木基因工程育种研究发掘优异的基因资源。
胡杨基因组片段转化拟南芥表型研究
Phenotypic Study of Arabidopsis thaliana Transformed by Genome Fragment from Populus euphratica
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摘要:
目的 本研究旨在探索与挖掘胡杨基因组大片段的潜在功能,发掘具有潜在育种价值的胡杨基因簇。 方法 利用已构建的胡杨基因组BIBAC文库,采用花序浸染法,将胡杨基因组大片段78A2D10导入模式植物拟南芥基因组中。采用抗性筛选、分子检测及表型观察等方法鉴定、分析转化型植株。 结果 共获得15株特异表型的转化植株。与野生型相比,转化型植株主侧茎生长受到抑制,莲座叶面积增大近3倍,叶片数量增多,叶边缘皱缩,抽薹推迟约13周,株高增加近32.0 cm,侧茎发育成次生莲座,植株寿命延长约7周。 结论 胡杨基因组片段78A2D10可延长植株营养生长期及植株寿命,据此推测该基因片段可能与营养生长有关。 Abstract:Objective The study aims at exploring and excavating the potential function of large genome fragment cloned from Populus euphratica, and finding out the potential gene clusters with breeding value. Method Based on BIBAC library, the fragment 78A2D10 from the genome of P. euphratica, was inserted into the genome of Arabidopsis thaliana by the method of floral-dip. Resistance selection, molecular identification and phenotypic observation were applied to identify and analyze the transgenic plants. Result Fifteen transgenic plants with specific phenotype were obtained in the research. Compared with the wild plants, the positive plants showed the characters such as inhibited growth of the stems, 3 times rosette leaf area, more leaves, crimping blade edge, delayed bolting with 13 weeks, height increasing by 32.0 cm, developing lateral stems and prolonged lifetime with 7 weeks. Conclusion The fragment of 78A2D10 may prolong the vegetative growth and lifetime of plants. The fragment may be related to the vegetative growth of plants. -
Key words:
- Populus euphratica
- / genome large fragment
- / floral dip
- / Arabidopsis thaliana
- / phenotype
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